Localized chemisorption with the adsorbed molecule on each surface site has been generally accepted in current chemisorption study. For a surface of perfect homogeneity without interaction between adsorbates, the adsorption is Langmuir type, and the rate of adsorption is Localized chemisorption with the adsorbed molecule on each surface site has been generally accepted in current chemisorption study. For a surface of perfect homogeneity without interaction between adsorbates, the adsorption is Langmuir type, and the rate of adsorption is